[WGSL] @group, @binding and @location should accept expressions

[tadeuzagallo]

b2ed50a

[WGSL] @group, @binding and @location should accept expressions
https://bugs.webkit.org/show_bug.cgi?id=257471
rdar://109995472

Reviewed by NOBODY (OOPS!).

Currently we are only parsing integer literals as arguments to these attributes,
but according to the grammar they should accept any const expressions.

* Source/WebGPU/WGSL/AST/ASTBindingAttribute.h:
* Source/WebGPU/WGSL/AST/ASTGroupAttribute.h:
* Source/WebGPU/WGSL/AST/ASTLocationAttribute.h:
* Source/WebGPU/WGSL/AST/ASTStringDumper.cpp:
(WGSL::AST::StringDumper::visit):
* Source/WebGPU/WGSL/GlobalVariableRewriter.cpp:
(WGSL::RewriteGlobalVariables::collectGlobals):
(WGSL::RewriteGlobalVariables::insertStructs):
(WGSL::RewriteGlobalVariables::insertParameters):
* Source/WebGPU/WGSL/Metal/MetalFunctionWriter.cpp:
(WGSL::Metal::FunctionDefinitionWriter::visit):
* Source/WebGPU/WGSL/Parser.cpp:
(WGSL::Parser<Lexer>::parseAttribute):

b2ed50a

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[tadeuzagallo]

Not sure what happened here that caused the pull request to be opened twice...